package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.domain.Category;
import com.itheima.reggie.domain.Setmeal;
import com.itheima.reggie.domain.SetmealDish;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {
    @Autowired
    private SetmealDishService setmealDishService;

    @Autowired
    private SetmealService setmealService;

    @Autowired
    private CategoryService categoryService;





    //新增套餐，同时需要保存套餐和菜品的关联关系
    @Transactional
    public void saveWithDish(SetmealDto setmealDto){
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item)->{
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    // 删除套餐，同时需要删除套餐和菜品的关联数据
    @Transactional
    public void removeWithDish(List<Long> ids){
        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count=this.count(queryWrapper);
        if (count>0){
            //如果不能删除，抛出一个业务异常
            throw  new CustomException("套餐正在售卖中，不能删除");
        }
        //如果可以删除，先删除套餐表中的数据---setmeal
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper=new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        //删除关系表中的数据----setmeal_dish
        setmealDishService.remove(lambdaQueryWrapper);
    }

    //根据id查询套餐信息和对应的菜品信息
    /*@Override
    public SetmealDto getByIdWithDish(Long id) {
        Setmeal setmeal=this.getById(id);

        SetmealDto setmealDto=new SetmealDto();
        BeanUtils.copyProperties(setmeal,setmealDto);

        LambdaQueryWrapper<SetmealDish> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmeal.getId());
        List<SetmealDish> list=setmealDishService.list(queryWrapper);
        setmealDto.setSetmealDishes(list);
        return setmealDto;
    }*/

    @Override
    public SetmealDto getByIdWithDish(Long id) {
        //先获取套餐信息
        Setmeal setmeal = setmealService.getById(id);
        SetmealDto setmealDto=new SetmealDto();
        //把setmeal数据拷贝给setmealdto
        BeanUtils.copyProperties(setmeal,setmealDto);
        //还剩一个categoryname和 setmealDishes
        LambdaQueryWrapper<Category> lqw=new LambdaQueryWrapper<>();
        lqw.eq(setmeal.getCategoryId()!=null,Category::getId,setmeal.getCategoryId());
        Category category = categoryService.getOne(lqw);
        if (category!=null){
            String name = category.getName();
            setmealDto.setCategoryName(name);
        }
        LambdaQueryWrapper<SetmealDish> lqw1=new LambdaQueryWrapper<>();
        lqw1.eq(SetmealDish::getSetmealId,id);
        List<SetmealDish> list = setmealDishService.list(lqw1);
        setmealDto.setSetmealDishes(list);
        return setmealDto;
    }

    @Override
    @Transactional
    //修改套餐,同时需要修改套餐和菜品的关联数据
    public void updateWithDish(SetmealDto setmealDto) {
        this.updateById(setmealDto);
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
        setmealDishService.remove(queryWrapper);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        setmealDishService.saveBatch(setmealDishes);
    }


}
